The Guardian's home affairs editor Alan Travis explains that in light of Cameron's intervention, Clarke may feel his time as justice secretary is drawing to a close.

Also this week: Julian Astle, former director of Centre Forum and a Lib Dem insider, joins us in the pod to outline the arguments made in a Guardian comment piece this week. He claims that Blairites, Cameroons and Lib Dem Orange Bookers would be more content in a party of their own - and that they are increasingly distant from the parties they are supposed to represent. Columnists Anne Perkins and Madeleine Bunting join the discussion.